JPH0229354Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a connecting fitting for connecting a high-pressure hose to one end thereof.

[Conventional technology]

Traditionally, connecting fittings for connecting high-pressure hoses with a normal operating pressure of about 70 to 350 kg/cm ² have a through hole 3 in the center of the shaft and are fixed to equipment, etc. at one end, as shown in Figure 4. A hose insertion part 2 having a much smaller diameter than the connection thread part 1 is integrally formed at the other end, and a nut part 4 and a hose insertion part 2 are provided between the connection thread part 1 and the hose connection part 2. The other end side is provided with an annular groove 5 formed by a nut part 4 and an annular part 8. Furthermore, an inward annular protrusion 6 formed at one end of the joint outer cylinder part 6 is fitted into the annular groove 5 so that the hose insertion part 2 can be surrounded and mounted.

However, conventional high pressure hose connection fittings have a large diameter.
Connecting threaded part 1, nut part 4, annular groove 5 to the book rod
Of course, the hose insertion part 2, which has a much smaller diameter than the bar material, was also manufactured by cutting. Furthermore, since a tube material having an inner diameter smaller than the minimum diameter of the annular hole 3 and an outer diameter larger than the maximum diameter of the nut portion 4 is generally not available, it was also necessary to drill the through hole 3. Therefore, these processes require a considerable amount of time,
In particular, in order to form the hose insertion portion 2 with a small diameter, an excessive amount of machining time is required, and an excessive amount of material is discarded as cutting waste, resulting in an increase in manufacturing costs.

[Problem that the invention attempts to solve]

This invention can reduce processing time and material loss,
An object of the present invention is to provide a high-pressure hose connection fitting that can be manufactured at low cost.

[Means for solving problems]

The high-pressure hose connection fitting of the present invention has a through hole at the center of the shaft, and a connection screw portion formed on the outer periphery of one end,
a cylindrical joint base having a press-fit inner wall formed at the other end and having an inclined outer peripheral surface whose outer diameter gradually increases from one end to the other end on at least a part of the outer peripheral surface; separate from the joint base; a press-fit outer wall portion having an inner diameter approximately equal to the inner diameter of the press-fit inner wall portion at the axial center thereof, and a press-fit outer wall portion having an enlarged diameter at one end; and a hose insertion part with a stepped part; with their center lines aligned, the stepped part of the press-fit outer wall part is crimped to the other end surface of the press-fit inner wall part, and the press-fit outer wall part is attached to the outer periphery of the press-fit inner wall part. It is crimped and fixed into one piece.

〔Example〕

An embodiment of the present invention will be described with reference to FIGS. 1 to 3.

The high-pressure hose connection fitting of the present invention is divided into a large-diameter joint base 9 shown in FIG. 2 and a small-diameter hose insertion part 2 shown in FIG. A major feature is that it is crimped and fixed to the outer periphery of the press-fit inner wall portion 10 and is integrated into a single high-pressure hose connection fitting.

The joint base 9 in FIG. 2 is a cylindrical body having a through hole 3 at the center of the shaft, and a connecting threaded portion 1, a nut portion 4, an annular groove 5, and an annular wall 8 are formed in order from one end as in the conventional case. be. A small-diameter press-fit inner wall portion 10 is formed at the other end of the annular groove 5, and at least a portion of the outer circumferential surface of the press-fit inner wall portion 10 is an inclined outer circumferential surface whose outer diameter gradually increases from one end side to the other end side. 11, and the other end of the press-fit inner wall portion 10 is an inclined end surface 12 with the outer peripheral end protruding toward the other end than the inner peripheral end.

The hose connection part 2 in FIG. 3 is formed separately from the large-diameter joint base 9, and has a through hole 3 having an inner diameter approximately equal to the inner diameter of the press-fit inner wall part 10 at the center of the shaft. is expanded in diameter to form a press-fit outer wall portion 13 into which the press-fit inner wall portion 10 of the joint base 9 is press-fitted.
A wedge-shaped stepped portion 14 is formed at the boundary between the inner surface of the press-fit outer wall portion 13 and the through hole 3, and this wedge-shaped step portion 14 has a shape that comes into close contact with the inclined end surface 12 of the press-fit inner wall portion 10 when combined with the joint base 9. It has a stepped inclined surface 15.

Furthermore, as shown in FIG. 1, in the annular groove 5 of the joint base 9, the joint outer cylinder part 6 surrounds the hose insertion part 2 by depositing an inward annular projection 6 formed at one end thereof, as in the conventional case. It is now possible to install it.

[Effect]

Since the outer circumferential surface of the tip of the press-fit inner wall 10 of the joint base 9 has approximately the same diameter as the inner circumferential surface of the press-fit outer wall 13 of the hose insertion section 2, it can be press-fitted into the press-fit inner wall 10 as shown in FIG. The joint base 9 and the hose insertion portion 2 can be integrally fixed by press-fitting the outer wall portion 13. When both are press-fitted and combined, the inclined end face 12 of the press-fit inner wall portion 10 and the stepped inclined face 15 of the press-fit outer wall portion 13 are brought into close contact, and sealing performance is maintained.

In particular, if the press-fit inner wall part 10 of the joint base 9 is formed to be thicker and slightly longer in the axial direction than the press-fit outer wall part 13 of the hose insertion part 2, the press-fit outer wall surface 13 can be easily formed after press-fitting. By tightening, the inner surface is crimped to the inclined outer circumferential surface 11 of the press-fit inner wall part 10 so that it cannot be separated, and the inclined end face 12 of the press-fit inner wall part 10 and the stepped inclined surface 15 of the press-fit outer wall part 13 are completely and firmly attached. It is easy to do.

[Effect of idea]

According to the present invention, the large-diameter joint base is formed from a large-diameter bar material, and the small-diameter hose insertion portion is formed from a small-diameter bar or tube material by cutting, and then these are press-fitted and fixed together. Time and material loss can be significantly reduced, and high-pressure hose connection fittings can be provided at low cost. In particular, the hose insertion part can now be manufactured by cutting from a tube material with approximately the same outer diameter, which has the advantage of eliminating the need for drilling a through hole.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway side view of the high pressure hose connection fitting of the present invention, FIG. 2 is a partially cutaway side view of the joint base, and FIG. 3 is a partially cutaway side view of the hose connection part. FIG. 4 is a partially cutaway side view of a conventional high-pressure hose connection fitting. 1...Connection screw part, 2...Hose insertion part, 3...
...Through hole, 5...Annular groove, 6...Joint outer cylinder part, 9
. . . Joint base, 10 . . . Press-fit inner wall portion, 11 .

Claims (1)

[Scope of utility model registration request] It has a through hole at the center of the shaft, a connecting thread formed on the outer periphery of one end, and an inclined outer circumferential surface formed on at least a part of the outer circumferential surface of the other end, the outer diameter of which gradually increases from one end to the other end. a cylindrical joint base having a press-fit inner wall; formed separately from the joint base, having a through-hole in the axial center with an inner diameter approximately equal to the inner diameter of the press-fit inner wall; the through-hole expanding at one end; It consists of a press-fit outer wall with a diameter, and a hose insertion part with a step formed at the boundary between the inner surface of the press-fit outer wall and the through hole; press-fit the step of the press-fit outer wall with the center lines of both aligned. A high-pressure hose connection fitting formed by crimping the other end of the inner wall and fixing the press-fit outer wall to the outer periphery of the press-fit inner wall.